System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Trans Fluid Thermostat Performance
Code P07CB: Transmission Fluid Thermostat Performance
Diagnostic & Technical Explanation
Code P07CB (Transmission Fluid Thermostat Performance) sets when the transmission fluid thermostat/bypass valve fails to regulate fluid temperature into its expected warm-up curve, keeping fluid too cold (or too hot) for normal shift-quality control. Causes are a thermostat/bypass valve stuck open or closed, or a failed cooler bypass valve restricting flow through the transmission cooler.
First-listed procedure
Rank #1
Check transmission fluid level and cooler flow
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 2 procedure(s) are in the licensed dataset. Ordering context.
Full family: Trans Fluid Thermostat Performance
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)